StopOrDrive

Enter a 5-character code such as P0420, P0301, or P0457.

We don't have that code yet

Codes starting with P are engine and transmission, B are body, C are chassis, and U are network communication. A 0 as the second character means a generic code shared by all makes; a 1 means a manufacturer-specific code, so its meaning depends on your brand.

A steady check engine light usually means get it checked soon. A flashing check engine light means an active misfire: reduce speed and stop driving as soon as it is safe.

That doesn't look like an OBD-II code

A valid code is one letter (P, B, C, or U) followed by four characters, for example P0420.

P0521 Engine oil pressure sensor or switch range/performance

Can I drive with P0521?

Drive soon

OK to drive for now, but get it fixed within days to a couple of weeks, or the damage and the bill can grow.

Usually a sensor problem, but check your oil level right away. If the oil is low, treat this as Stop now.

What does P0521 mean?

The oil pressure reading does not match what the computer expects for engine speed and temperature.

What causes P0521?

  1. Faulty oil pressure sensor
  2. Low oil level
  3. Wrong oil viscosity
  4. Wiring problem
  5. Real low oil pressure from engine wear

How much does it cost to fix P0521?

$100 – $350

Oil pressure sensor replacement: $100–$300.

Confirm the code yourself

A low-cost scanner lets you read the code, clear it, and see if it comes back before paying for a diagnosis.

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